Ringing regulator



SGEN F.

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rnnnennrn oo lranr,

GF NEVI YORK,

SSI-GHOR I T0 AVIERCAN TELEHONE AND (3. CGRORATION OF NEW YORK.

RNGDlC-l BEGULATGR.

@riginal application 'filed September 1'?, 1918, Serial No. 254,493. Patent No. 3.408 734 dated March 3 l 7 1922. Divided and this application filed July l, 1921. Serial No. 481,5504.

`tiepternber 1'?, 1018, entitlec it iging regulatorsf9 issued as Patent No. 17e-08,78%, March i, i922.

lt has been 'found vdesirable when ringing overfcertain types of lines to have the ringing continue for a'certain interval ot time. A desirable interval for long distance lines has been found in practice to be approximately tivo seconds, although the interval may vary vunder different conditions. ln lloriner arrangements tor ringing over long distance lines the ringing would only continue during the interv l in which the operator held closed the ringing hey. W ith -such arrangements it lr s been found diiiicult to obtain a ringing interval which would be ot satisfactory or uniform duration. Accordingly, itis one of the objects ot this invention to provide means which will operate when the ringing key is thrown to insure the continuation ot the ringing for a satisfactory and uniform interval of tune. @ther and :further ob]ects ot the in volition will be clear Ytroni the detailed description to be given later.

rlhe ringing arrangements oi this invention may be associated with a cord circuit or a section of a transmission line. which will include a ringing` key. Controlled initially by this, ringing key is a chain or series ot slow-releasing` relays and means whereby ringing currei'xl .is applied to the cord circuit or trarsrnssion line.y llfhen the ringing hey oi the cord circuit or transinission line released the means 'tor applying ringing current to the cord circuit or 'transmission line Will reniain held operative by the chain or series ofsloiv-releasing relays during that interval which elapses while the chain or series ot slow-releasing relays are releasing. By increasing or decreasing the number or slow releasing relays in this chain the ringing interval may be prolonged shortened as desired.

The invention inay new be more fully understood With reiferenco to the accoinpanyv ing drawing. in the figure oi' which the arrangements of the'invention are illustrated as associated with a cord circuit. rEhe cord circuit includes the talking conductors e and 37 and terininatesin the plugs P1r and 2. 'At each end ot the cord circuit are the relays 1 and 2 which operate when the ringing keys K1 or K2 are thrown and sorveto connect the ringingrconductors '3 and l ot the link circuit to the plugs P1 and P2 respectively. Included in a bridge across the inging conductors is the Winding. of a transformer 7. Under the control ot either relay 1 or relay 2 is the slow-releasing relay 12. Under the control oi the slow-releasing relay 12 is a ringing circuit kincluding one Winding of the transformer 'T and terminating in a source 26 of ringin0` current. included in this circuit is a marginal relay 24- and the ballast lamp 25. Under the control of marginal relay 24 is a series olf slow-releasing relays such as the relays 28 and 29. rllhese relays in turn controlthe relay 12.V By means rof the conde. tors 33, 34 and 35 the ringing arrangements of this invention. may be made common-to a plurality ci cord circuits.

Vlhe invention may ncrv be more fully un.. dorst-ood from the iollowving description et its ope-ration. lf the plug P1 is'inserted in the jack of a long distance line over which it is desired to transmit ringing current, the operator will throw the lreyll and thereby close the following circuit: from ground and contact of key ing of relay 1 to battery and ground. The closing of this circuit Will energize relay 1, which Will connect the ringing conductors 3 and 4i kto the contacts of plug P1. The energization of relay 1 Will also closev the tollowing circuit; from `ground, contacts oi' key K. conductor 17. armature and contact of relay l, conductors 8 and 16, conta-ct 37, conductors 2O and 21. Winding or' relay12 to battery and ground. The closing of this circuit will energize the relay 12. The energization of relay 12 causes it to pull up its right-hand armature and open the circuit including its Winding at contact point 37, at

K1; conductor 17. Wind-` and It and. out .overthe longdistance line.

The. closing. of this last-mentioned ringing circuit Willenergize theimargmal .relay 24C, Whiclrfivill pull upfitsarmature and close `the following, circuit: from ground, lefthand armature and contact of1 relay 24, over conduotors23- and 21, Winding of relay 12 to batteryandground. y The closing of this circuitfwill serve to maintain'the relay 12 in anienergized condition andsprevent the ringing' circuitifrom being broken. The operation of relay 24- also closes the Vfollowing circuit: from ground, .righthandv armature and contactofarelay 2.4, .conductor-27, Windingy of slow-releasing relay. 28 .to battery and ground. The closing-of this circuit ener? giies .the relay 28, \vhicl1f\vill1pull up. its armatures and close thewfollowingl circuit: from: ground .1 and lefthand armature and contact of relayv28', conductors 30, 23, and 2.1., Winding ofl relay.` 12; to battery.y and ground. TheV closing-olf` this :last-,mentioned circuit Will also serve to maintain the relay 12 in an energized condition andto prevent the `ringing circuit fromwbeing broken. The operation ot relayv 28 also closed: the following, circuit: from ground, righthand armatureaHdcOntact of relay-28, conductor 31, Winding off. sloWLreJl-easin'g relay 29,- tobatter-y and ground/. The closing A oliv this cir-` cuit 'energizes ther slow-releasing .relayi 29,

which pulls `up itsv armature land Acloses-*the Y following* circuit from ground, lefthand armatura and Contact of relay` '29.,A conductors 32,323`randf21, Winding oli relayw12 to battery andfgrounda The closing oi. this l'astfmenti'onedjcircuit also servesztoA maintain'the relay: -12 .in an energized condition.

and yto prevent the ringing circuit from beingbroken;l

AAtteiwtlie first rush of ringing.- current overithe ringing circuit, the Afi-l'aine'nt of the lamp i125; ,WhichfisJ-ircludedf in the ringing circuitgw'ill become heated' andso= increase the 'Y resistancet of the ringing circ-uit that the-i marginalfrelay 24 will become deener'- gizedf- VlhenA the *marginal relay 2,4: be-

c, orrfesfde#eiie-rgized andf its lefthand i arma'- turey retractsy one oil. thecircuits formerly closed about the relay 12 will be opened andthe relay l2 Will now be maintained in an energized condition only by the circuits formerly closed upon the operation ot the slow-releasing"relays 12S-'and-29Q When the righthandfarmatureot` relay 2d retracts,

the before mentioned circuit about the slowreleasing relay 28 Will be broken. As the relay. 28` is a slow-releasing.relay.it Will hold up its armatures,momentarily andstill serve to maintain the relay 12 in an energized condition. Howeier, when the lefthand armature of relay-28. is released, it Will be seen that the relay 12 will nowrv be maintained in an energizedcondition only by the circuity formerly closed' upon the operation of relay 29;` 1When the righthand armature of relay 28 retracts, the circuit formerly closed through the. relayf29 Will be opened` As there-lay 29 isa slow-releasing relay, it Willi momentarilyV holdup.-

its armature and maintain the1 relay 12 in an energized condition. When thei armature of relay. 29 retractsthe circuit formerly closed thereby through thearelay 12 will be bi'olenand the relay. 1,2jafterl moev mentarily holding up its armatures, will become `deenerg i zed and, .by allowing itsv armatures to retract, Will open.y the beforementionedv ringing circuit and' allow-l th ringing operation .to cease. f

With the above described arrangements it will be seen that ringingcurrent Willfbe transmitted out over the transmission line for a period-.ottime comprisingthefinterval necessary. Ytor thefheatingfot the ballast@ lamp and the.deenergization. of. relay 24, together Withthe/intervals necessary lfor the releasing` in order of the slovvacting relays 28, .29 and-12. By increasing or. decreasing the number-ot1 slow acting relays,` such as the relays 2S and. 29=Which control relay12, the ringing. period` may bee in creased or decreased as .desired lVhile thev arrangements of the invention have been disclosed. in certain. specificare@ controlled lby said` slow-'releasingrelay:forA

closingsaid ringing'circuit and' dissociating said' slow-releasing' relay' -from'- said switchingv means,H a series ofv sloyv-releasing relays controlled. by said marginal relay: and means controlled by said series of slow-releasing relays lor controlling said first inentioned slow-releasing relay.

2. ln a signaling system, a link circuit including' switching' means. a slonvreleasing relay primarily controlled by said sWitcliing' means, a. ringingcircuit including1 a source of current and a marginal relayv` means controlled by said slow-releasing; relay .for closing said ringing circuit and dissoeiating;r said slow-releasing` relay from said switching; means` a series of slow-releasing relays controlled by said marginal relay, means controlled by said series of slow-releasingl relays for controlling' said irst mentioned slow-releasing relay and automatically operating means in said ringing circuit for controllingl said marginal relay.

ln a signaling system, a plurality of link circuits, signaling keys in each of said link circuitsy a slow-releasingrelay under the initial control of each eli said signaling; keys, a transformer hai/ing one oi its Windings associated in common with all of said link circuitsv` a ringing' circuit includinga source of current and the other Winding of said transformer, means controlled by said slow-releasing relay for closing said ringing circuit and means associated With said ringing circuit for dissociating said relay from said signaling keys,

ln testimony whereof, l have signed my name to this specification this 30th day of June, 1921.

JHN F. TQOMEY. 

